| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1937 | ----- | z | 41.64 | 49.61 | 50.33 | 63.71 | 71.47 | 85.52 | 81.19 | 72.57 | 60.29 | 47.83 | 41.77 | 60.54 | ||||||||||||
| 1938 | 40.23 | 37.25 | 37.71 | 52.22 | c | 62.73 | a | 73.03 | a | 82.90 | 83.73 | a | 77.03 | 59.03 | 44.67 | 40.94 | 57.62 | |||||||||
| 1939 | 39.45 | 39.93 | a | 50.97 | 62.37 | 66.57 | a | 71.23 | 84.74 | 85.58 | 74.47 | 61.48 | 56.20 | 41.94 | 61.24 | |||||||||||
| 1940 | 41.19 | 41.17 | 50.39 | 60.83 | 74.26 | 82.33 | 79.84 | 87.19 | 69.79 | b | 60.81 | e | 42.28 | a | 38.77 | 60.74 | ||||||||||
| 1941 | 39.52 | 44.25 | 53.32 | 55.33 | 63.10 | 67.20 | 83.65 | 75.39 | 64.47 | 57.23 | 49.90 | 37.74 | 57.59 | |||||||||||||
| 1942 | 38.35 | 39.25 | 46.74 | 54.57 | 58.71 | 70.07 | 84.35 | 84.10 | 76.17 | 64.58 | 42.57 | 39.32 | 58.23 | |||||||||||||
| 1943 | 37.48 | 43.54 | 47.03 | 57.20 | 61.29 | 64.27 | 82.97 | 78.55 | 81.67 | 57.26 | 49.50 | 40.84 | 58.47 | |||||||||||||
| 1944 | 37.32 | 39.10 | 47.39 | 51.77 | 65.00 | 67.03 | 80.26 | 80.35 | 74.93 | 66.97 | 43.83 | 38.61 | 57.71 | |||||||||||||
| 1945 | 40.61 | 41.68 | 43.28 | b | 50.62 | i | 60.53 | a | 72.46 | b | 87.03 | 83.94 | 73.80 | 65.71 | 40.37 | 34.74 | 58.56 | |||||||||
| 1946 | 37.81 | 39.82 | 45.29 | 58.43 | 67.13 | 69.70 | 82.61 | 84.35 | 71.50 | 53.06 | 41.83 | 42.00 | 57.80 | |||||||||||||
| 1947 | 39.45 | 47.21 | 51.74 | 58.83 | 72.55 | 65.63 | 78.32 | 79.10 | 75.50 | 59.13 | 42.63 | 40.61 | 59.23 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.97 | a | 75.29 | 68.57 | 60.48 | 44.07 | 31.94 | 59.72 | ||||||
| 1949 | 32.61 | 37.29 | 43.45 | 60.67 | 65.16 | 75.62 | a | 83.39 | 80.81 | 74.27 | 56.06 | 54.43 | 35.71 | 58.29 | ||||||||||||
| 1950 | 28.90 | k | ----- | z | ----- | z | ----- | z | 77.57 | x | 74.13 | 85.55 | 85.16 | 75.10 | 59.43 | a | 51.57 | 49.94 | 68.70 | |||||||
| 1951 | 42.03 | 48.21 | 50.74 | 67.33 | ----- | z | 83.17 | 85.75 | w | 78.00 | r | 77.17 | 55.68 | 44.93 | 34.58 | 55.98 | ||||||||||
| 1952 | 30.84 | 39.93 | 41.58 | 59.27 | 65.35 | 67.93 | 85.19 | 81.58 | 80.40 | 71.90 | 46.83 | 36.10 | 58.91 | |||||||||||||
| 1953 | 41.65 | 45.68 | 46.16 | 53.07 | a | 54.97 | 64.80 | 84.94 | 75.94 | 79.57 | 61.23 | 47.27 | 41.35 | 58.05 | ||||||||||||
| 1954 | 36.06 | 48.82 | 45.00 | 57.67 | 70.61 | 67.83 | 82.58 | 73.42 | 70.47 | 61.35 | 52.30 | 40.19 | 58.86 | |||||||||||||
| 1955 | 37.90 | 42.25 | 44.48 | 45.80 | 62.68 | 74.86 | a | 77.32 | 84.10 | 72.73 | 61.00 | 41.87 | 35.71 | 56.73 | ||||||||||||
| 1956 | 35.55 | 36.34 | 45.97 | 57.67 | 65.58 | 68.97 | 81.65 | 76.55 | 72.77 | 54.97 | 48.63 | 43.19 | 57.32 | |||||||||||||
| 1957 | 30.45 | 44.18 | 44.42 | 54.50 | 63.29 | 74.77 | 77.58 | 75.19 | 74.30 | 51.90 | 43.53 | 40.00 | 56.18 | |||||||||||||
| 1958 | 37.39 | 40.93 | 41.52 | 50.17 | 71.58 | 69.87 | 82.86 | b | 84.32 | 69.93 | 65.35 | 47.17 | 43.81 | 58.74 | ||||||||||||
| 1959 | 38.55 | 39.39 | 48.65 | 60.60 | 59.52 | 72.50 | 85.55 | 78.69 | b | 65.13 | 62.13 | 54.00 | 40.35 | 58.75 | ||||||||||||
| 1960 | 33.13 | 39.21 | 46.94 | 53.27 | 58.74 | 77.67 | 86.35 | 77.94 | 76.03 | 61.94 | 42.00 | 40.71 | 57.83 | |||||||||||||
| 1961 | 42.16 | 40.50 | 43.26 | 56.43 | 61.29 | 80.70 | 84.55 | 83.03 | 69.27 | 59.84 | 44.03 | 37.13 | 58.52 | |||||||||||||
| 1962 | 39.06 | 38.64 | 42.23 | 61.43 | 57.10 | 73.63 | 81.10 | 75.74 | 75.80 | 59.97 | 48.00 | 41.87 | 57.88 | |||||||||||||
| 1963 | 41.68 | 48.46 | 45.65 | 45.70 | 65.29 | 69.67 | 76.48 | 78.74 | 75.23 | 58.65 | 41.47 | 41.52 | 57.38 | |||||||||||||
| 1964 | 35.23 | 44.17 | ----- | z | 52.40 | 61.65 | 68.67 | 81.52 | 79.55 | 73.33 | 66.16 | 40.33 | 34.26 | 57.93 | ||||||||||||
| 1965 | 37.10 | 45.14 | 50.39 | 54.60 | 63.06 | 73.70 | 82.16 | 77.23 | 69.77 | 68.19 | 44.67 | 36.19 | 58.52 | |||||||||||||
| 1966 | 36.06 | 39.64 | 46.77 | 60.13 | 69.97 | 70.28 | a | 78.68 | 81.97 | 74.70 | 63.45 | 44.27 | 38.00 | 58.66 | ||||||||||||
| 1967 | 37.74 | 46.36 | 41.32 | 43.33 | 66.65 | 74.33 | 85.55 | 88.03 | 80.24 | a | 60.53 | a | 49.13 | 35.00 | d | 59.02 | ||||||||||
| 1968 | 37.29 | 43.79 | a | 48.65 | 54.27 | 63.13 | 74.67 | 84.84 | 72.48 | 73.07 | a | 59.19 | 41.45 | a | 33.16 | 57.16 | ||||||||||
| 1969 | 32.13 | a | 35.75 | 46.45 | 52.34 | a | 69.81 | 72.17 | 80.19 | 80.71 | 72.50 | 53.90 | 52.07 | 38.71 | 57.23 | |||||||||||
| 1970 | 35.74 | 45.04 | 45.87 | 47.10 | 66.29 | 74.17 | 83.48 | 84.48 | 69.30 | 58.39 | 42.57 | 32.10 | 57.04 | |||||||||||||
| 1971 | 38.52 | 41.39 | 41.13 | a | 51.10 | 63.13 | 68.93 | 82.90 | 84.68 | 69.50 | 57.16 | 42.73 | 31.42 | 56.05 | ||||||||||||
| 1972 | 33.58 | 39.76 | 48.55 | 49.93 | 67.77 | 75.57 | 83.55 | 82.65 | 67.70 | 59.00 | 36.83 | 30.39 | 56.27 | |||||||||||||
| 1973 | 30.26 | 40.29 | 43.35 | 56.27 | 69.16 | 74.17 | 84.10 | 81.23 | 72.50 | 57.84 | 36.50 | 35.84 | 56.79 | |||||||||||||
| 1974 | 32.45 | 38.32 | 43.26 | 50.10 | 59.90 | 78.53 | 81.19 | 83.61 | 80.80 | 66.77 | 46.27 | 36.26 | 58.12 | |||||||||||||
| 1975 | 38.45 | 38.07 | 40.45 | 45.50 | 63.39 | 69.63 | 80.94 | 75.35 | 78.67 | 52.61 | 41.30 | 38.55 | 55.24 | |||||||||||||
| 1976 | 39.06 | 40.21 | 45.16 | 48.17 | 68.55 | 68.77 | 80.61 | 72.29 | 75.20 | 65.71 | 51.40 | 41.00 | 58.01 | |||||||||||||
| 1977 | 37.06 | 46.61 | 43.00 | 62.03 | 54.87 | 78.07 | 81.00 | 82.42 | 67.43 | 62.52 | 43.27 | 37.97 | 58.02 | |||||||||||||
| 1978 | 38.32 | 40.82 | 52.77 | a | 49.73 | 61.42 | 72.83 | 80.03 | 76.77 | 65.40 | 68.81 | 41.93 | 33.10 | 56.83 | ||||||||||||
| 1979 | 33.39 | 37.54 | 48.39 | 51.10 | 67.55 | 74.87 | 81.29 | 75.97 | 77.37 | 61.55 | 42.07 | 38.45 | 57.46 | |||||||||||||
| 1980 | 35.94 | 42.21 | 44.97 | 56.23 | 61.77 | a | 64.73 | 81.81 | 78.81 | 74.57 | 63.00 | 46.00 | 40.84 | 57.57 | ||||||||||||
| 1981 | 41.58 | 43.60 | c | 49.03 | 59.03 | 62.13 | 73.80 | 82.26 | 85.23 | 74.40 | 57.45 | 46.13 | 37.36 | c | 59.33 | |||||||||||
| 1982 | 33.90 | 39.43 | 43.78 | m | 48.05 | i | 67.16 | l | 73.60 | e | 78.61 | 82.48 | 68.80 | 59.06 | 40.75 | j | 36.47 | l | 62.27 | |||||||
| 1983 | 41.16 | l | 38.94 | j | 43.57 | j | 49.17 | l | 68.37 | l | 68.27 | 77.55 | 79.32 | 73.53 | 63.95 | j | 43.56 | l | 36.06 | m | 74.67 | |||||
| 1984 | 41.94 | m | 44.20 | n | 50.45 | k | 48.28 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.31 | r | 39.93 | 35.35 | 37.64 | |||
| 1985 | 43.90 | 43.75 | 46.68 | 58.86 | i | 67.26 | 77.07 | 88.03 | 78.44 | f | 65.59 | a | 64.43 | a | 44.38 | q | 47.50 | k | 62.09 | |||||||
| 1986 | 42.57 | q | 46.69 | l | 55.73 | p | 58.21 | k | 67.00 | m | 80.80 | 80.77 | 87.81 | 66.20 | 67.36 | i | 44.41 | m | 40.72 | m | 78.90 | |||||
| 1987 | 39.11 | m | 46.12 | l | 49.53 | l | 70.90 | i | 70.23 | 79.54 | d | 77.23 | 84.90 | a | ----- | z | 75.61 | 54.53 | k | 39.06 | n | 77.50 | ||||
| 1988 | 41.42 | s | 51.50 | s | 54.93 | q | 59.64 | s | 65.38 | r | 72.21 | k | 86.97 | b | 87.23 | 79.30 | 76.03 | 43.00 | 40.40 | a | 68.82 | |||||
| 1989 | 42.63 | l | 37.16 | i | 47.00 | i | 63.42 | k | 63.09 | i | 77.53 | 81.35 | 78.55 | 75.57 | 61.13 | 52.95 | k | 47.72 | m | 74.83 | ||||||
| 1990 | 41.74 | l | 39.53 | i | 51.94 | o | 65.44 | l | ----- | z | 72.13 | 85.77 | 80.58 | 79.93 | 62.26 | ----- | z | ----- | z | 76.14 | ||||||
| 1991 | 41.00 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 85.68 | 84.16 | 84.07 | ----- | z | ----- | z | ----- | z | 84.64 | ||||
| 1992 | ----- | z | 50.64 | r | ----- | z | ----- | z | 76.55 | 77.87 | ----- | z | 82.36 | q | 79.75 | v | ----- | z | 51.00 | z | 30.93 | q | 77.21 | |||
| 1993 | 32.56 | v | 38.30 | r | 46.89 | m | 53.13 | o | 67.16 | l | 68.18 | m | 71.59 | i | 77.35 | 76.20 | 65.81 | 43.03 | 35.11 | l | 65.60 | |||||
| 1994 | 40.60 | k | 39.94 | j | 55.77 | i | 53.10 | t | 63.40 | u | 66.88 | e | 88.94 | m | 83.86 | x | 81.71 | i | 59.65 | 37.07 | 30.71 | x | 54.53 | |||
| 1995 | 37.70 | u | 46.88 | l | 45.11 | m | 54.78 | l | 62.48 | 70.53 | 81.65 | 80.87 | ----- | z | 62.39 | 49.87 | 40.72 | m | 67.96 | |||||||
| 1996 | 37.42 | 42.86 | 50.55 | 53.97 | 59.23 | a | 73.80 | 85.84 | 83.45 | 71.07 | 58.06 | 46.10 | 36.06 | 58.20 | ||||||||||||
| 1997 | 36.03 | 40.54 | 49.03 | 52.33 | 70.06 | 69.13 | 79.81 | ----- | z | 71.53 | 58.39 | 43.53 | 36.55 | 55.18 | ||||||||||||
| 1998 | 37.48 | 37.54 | 46.52 | 54.03 | 53.52 | 70.47 | 85.10 | 85.84 | 78.07 | 61.68 | 39.80 | 35.03 | 57.09 | |||||||||||||
| 1999 | 38.81 | 35.75 | 42.74 | 50.33 | 60.52 | 70.03 | 81.39 | 77.74 | 77.93 | 67.06 | 47.07 | 41.00 | 57.53 | |||||||||||||
| 2000 | 36.68 | 41.24 | l | 45.50 | a | 59.40 | 61.41 | n | 77.17 | a | 81.94 | o | 85.27 | i | 78.71 | p | 59.40 | k | 41.70 | 40.19 | 50.11 | |||||
| 2001 | 39.84 | 40.14 | 49.58 | 51.00 | 72.42 | 69.27 | 80.61 | 87.26 | 76.47 | 65.35 | 44.77 | 35.93 | a | 59.39 | ||||||||||||
| 2002 | 36.10 | 44.18 | 45.81 | 58.03 | 63.52 | 75.60 | 87.19 | 79.74 | 76.00 | 62.48 | 46.77 | 37.03 | 59.37 | |||||||||||||
| 2003 | 41.00 | 43.43 | 47.58 | 48.27 | 63.26 | 79.80 | 88.94 | 83.36 | i | 77.96 | g | 66.31 | e | 40.04 | e | 36.90 | 55.55 | |||||||||
| 2004 | 36.84 | 39.38 | 55.61 | h | 59.07 | 62.68 | 74.30 | 83.81 | ----- | z | 72.10 | 59.74 | 45.53 | 41.45 | 57.49 | |||||||||||
| 2005 | 37.87 | 45.07 | 52.10 | 52.70 | 60.97 | 65.63 | 86.16 | f | 84.32 | f | 75.95 | h | 61.16 | 42.53 | 35.23 | 50.36 | ||||||||||
| 2006 | 35.74 | 40.54 | 39.65 | 53.64 | e | 67.32 | 77.27 | 88.59 | i | 82.16 | 77.64 | e | 64.16 | 41.40 | 37.42 | 56.08 | ||||||||||
| 2007 | 38.08 | f | 40.68 | 52.94 | 55.10 | 68.39 | 74.27 | 85.61 | 83.76 | f | 72.60 | 54.16 | 49.87 | 33.87 | 58.75 | |||||||||||
| 2008 | 32.44 | f | 41.62 | 44.58 | 48.82 | h | 64.03 | 72.23 | 84.71 | 83.27 | e | 77.80 | 61.04 | g | 47.23 | 34.35 | 61.09 | |||||||||
| 2009 | 40.81 | 40.68 | 44.30 | a | 54.43 | 67.30 | a | 71.10 | a | 86.14 | c | 81.06 | 80.47 | 55.97 | 44.10 | 32.23 | 58.22 | |||||||||
| 2010 | 39.03 | 40.93 | 48.32 | 49.53 | 56.48 | 68.17 | 84.26 | 80.90 | 72.37 | 61.84 | 42.20 | 35.16 | 56.60 | |||||||||||||
| 2011 | 40.42 | 39.75 | 42.16 | 48.50 | 56.48 | 68.10 | j | 76.94 | m | 84.00 | j | 79.17 | l | 60.21 | b | 41.97 | 41.32 | 46.35 | ||||||||
| 2012 | 40.00 | 41.90 | 42.61 | 54.47 | 63.84 | 66.77 | 81.58 | 85.39 | 80.10 | 61.32 | l | 43.28 | a | 40.13 | 58.19 | |||||||||||
| 2013 | 36.97 | a | 41.44 | s | 50.17 | m | 52.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.00 | z | 36.97 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.49 | 41.50 | 46.16 | 54.20 | 64.25 | 72.54 | 82.69 | 80.99 | 74.01 | 61.36 | 44.83 | 37.90 | 57.95 | |||||||||||||
| S.D. | 3.06 | 3.13 | 3.58 | 4.93 | 4.86 | 4.44 | 2.91 | 3.96 | 4.43 | 4.78 | 4.19 | 3.56 | 1.15 | |||||||||||||
| SKEW | -0.46 | 0.45 | 0.04 | 0.12 | 0.12 | 0.27 | -0.16 | -0.25 | -0.17 | 0.69 | 0.57 | 0.32 | 0.49 | |||||||||||||
| MAX | 43.90 | 48.82 | 53.32 | 67.33 | 76.55 | 83.17 | 88.94 | 88.03 | 84.07 | 76.03 | 56.20 | 49.94 | 61.24 | |||||||||||||
| MIN | 30.26 | 35.75 | 37.71 | 43.33 | 53.52 | 64.27 | 76.48 | 72.29 | 64.47 | 51.90 | 36.50 | 30.39 | 55.24 | |||||||||||||
| NO YRS | 60 | 61 | 59 | 58 | 62 | 70 | 67 | 64 | 67 | 68 | 67 | 64 | 46 | |||||||||||||